(a) Ascending limb of Henle’s loop is impermeable to water, whereas the descending limb is permeable to it.
(b) Reabsorption of water from distal parts of the tubules is facilitated by the hormone vasopressin.
(c) Dialysis fluid contains all the constituents as in plasma, except the nitrogenous wastes.
(d) A healthy adult human excretes (on an average) 25-30 gm of urea/day.
Describe the role of liver, lungs and skin in excretion.
What is meant by the term osmoregulation?
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell.
What is a mesosome in a prokaryotic cell? Mention the functions that it performs.
Name two cell-organelles that are double membrane bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.
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